Webster's English Dictionary

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indelible

in.del.ible \in-'del-*-b*l\ \-ble-\ aj [ML indelibilis, alter. of L 
   indelebilis, fr. in- + delebi]lis delible 1: that cannot be removed, washed 
   away, or erased  2: making marks that cannot easily be removed {an ~ 
   pencil}  - in.del.i.bly av